TTL signal is a standard signal that TFT-LCD can recognize, and even the LVDS TMDS used later is encoded on its basis. The TTL signal line has a total of 22 (minimal, uncalculated and power) divided into R G B tri-color signal, two HS VS field synchronization signal, one data enable signal DE a clock signal CLK, where R G G three-base color is different according to the number of bits of the screen, and different data lines (6 bits, And 8-bit point) 6-bit screen and 8-bit screen tri-color are R0-R5 (R7) G0-G5 (G7) B0-B5(B7) tricolor signal is a color signal, misalignment will make the screen display color disorder.
The other 4 signals (HS VS DE CLK) are the control signals, and misconnections will make the screen points unlit and do not display properly. Because the TTL signal level is about 3V, it has a great effect on the long-distance transmission of high-rate, and the resistance to interference is also poor. So then there is the LVDS interface screen, as long as the XGA above the resolution rate of the screen is using LVDS mode.
LVDS is also divided into single channels, dual channels, 6 bits, 8 bits, fractions, the principle and TTL division is the same. LVDS (low-pressure differential signal) works by using a dedicated IC to encode the input TTL letter into an LVDS signal, 6 bits as 4 differentials, 8 bits for 5 differentials, data line names d0-D0-D1-D2-CK-CK-Ck-If it is a 6-bit screen, there is no D3 – The D3 plus set of signals, which is encoded on our computer board. On the other side of the screen, there is also a decoding IC with the same function, turning the LVDS signal into a TTL signal, and the screen ends with the TTL signal, because the LVDS signal level is about 1V, and the interference between the lines and the lines can cancel each other out. So the anti-jamming ability is very strong.
It is ideal for use on screens with high code rate due to high resolution. Because the high-score screen 1400X1050 (SXGA) 1600X1200 (UXGA) resolution rate is too high, the signal code rate is also correspondingly improved, relying on all the LVDS transmission has been overwhelmed, so they are using a two-way LVDS interface to reduce the rate of each LVDS. Guaranteed signal stability
Post time: Jul-24-2019